Starrag developed a new tooling concept and milling strategy for roughing, semi-finishing and finish-machining blisks, which are usually made of titanium or nickel-based alloys. Less passes are necessary using the barrel cutter because it has a larger radius than a ballnose end mill. Blade-finishing machining time is reduced by 75 percent compared to conventional strategies using ballnose cutters (from 5 minutes and 17 seconds to 1 minute and 13 seconds). The blade-finishing process is performed using a Starrag barrel cutter with a novel design, enabling cuts as deep as 4 mm (a cutting depth of 3 mm was used in this specific part example). This method is said to be ideal for rough-slot milling the blisk, because the tooth load stays constant during a cut, thus improving metal removal rates and tool life.Īfter the subsequent semi-finishing passes, blade- and hub-finishing operations are performed. Starrag’s milling strategy starts with three trochoidal milling passes that feed an end mill in circular movements to create slots. The 48-blade blisk features a diameter of 520 mm, height of 34 mm and length of 35 mm. The reference workpiece the company uses to demonstrate this process is a blisk made from the titanium alloy Ti6Al4V used for intermediate- and high-pressure compressors and aircraft engines.
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The centerpiece of the improved milling strategy is the finishing operation, which helps to reduce the total machining time by 50 percent, Starrag says. Swiss machine tool builder Starrag (Hebron, Kentucky) has addressed these problems by developing a new tooling concept and milling strategy for roughing, semi-finishing and finish-machining blisks. As a result, efficient machining methods need to be developed. Subsequently, these components become very expensive to produce. Blisks are usually machined from a solid billet of hard, exotic materials, such as titanium and nickel-based alloys, which makes them difficult to machine and leads to long cycle times. Many of the new designs for both military- and civil-aircraft turbine engines feature blisk rotors instead of single-bladed rotor assemblies because of their significant weight reduction, greater resilience and reduced maintenance.
#Blisk lies series
We encourage you to use your judgement and donate where you feel you can make the most difference.Compared with a standard machine with a swivel rotary table, the NB series features an angled B axis on which the tool is effectively rotated around the tool centerpoint. If you would like to make a donation, please visit where you will find comprehensive list of nonprofits and charitable foundations with a history of success and transparent reporting. While the war continues on, Ukraine is still in dire need of support. With the help of nearly 1000 audience members, and several hundred more who tuned in online, the benefit successfully raised over $34,000 in one day! You can watch the 4.5hr long concert, featuring 55 local musicians here. The photo above is from the “With Ukraine” Benefit Concert (March 11, 2022), organized by a collective of local artists and musicians who came together the day after the invasion began (more info here), with the goal of raising awareness about the invasion, sharing Ukrainian culture, and raising funds to purchase humanitarian, military and other aid for Ukraine. We are devastated by the unprovoked Russian invasion of Ukraine, and are working tirelessly both together and separately to help Ukraine in any way we can. Did you know that all three members of BLISK have Ukrainian roots? Nastasia Y was born in Ukraine, Stephania was born into the Ukrainian-Canadian diaspora, and Ekaterina has some Ukrainian ancestry.